New England Distribution

Non-native: introduced
(intentionally or
unintentionally); has become naturalized.

County documented: documented
to exist in the county by
evidence (herbarium specimen, photograph). Also covers
those considered historical (not seen in 20 years).

State documented: never been
documented from the
county, but known from the state. May be present. Or,
may be restricted to a small area or a habitat (alpine,
marsh, etc.), so unlikely found in some
counties.

Note: when native and non-native
populations both exist in a county, only native status
is shown on the map.

var.pergratus

Native to North America?

Sometimes Confused With

axis of inflorescence with stipitate glands and inflorescence with usually 9-22 flowers (vs. R. pensilvanicus, with the axis of inflorescence lacking stipitate glands and inflorescence with usually 7-12 flowers).

5×22.
Rubus canadensis
×
Rubus pensilvanicus
→ This rare blackberry hybrid is known from
ME,
NH. It is marked by stems with sparse, thin prickles that number 0–7 per 10 cm. The leaves closely resemble those of
Rubus canadensis but have sparse to moderate pubescence abaxially. The raceme axis is densely (rarely only moderately) pubescent.

11×22.
Rubus enslenii
×
Rubus pensilvanicus
→ This very rare blackberry hybrid is known from
NH. It is marked by primocanes with arched to trailing habit, primocane leaflets numbering 3–5 and sparsely pubescent abaxially, stems with sparse, thin, slender prickles, 1- to 5-flowered inflorescences up to 8 cm long, and pedicels 2–6 cm long that lack stipitate-glands.

22×25.
Rubus pensilvanicus
×
Rubus recurvicaulis
→ This rare blackberry hybrid is known from
ME,
NH. It is marked by low-doming primocanes that are armed with relatively slender, straight to slightly curved prickles, leaflets that are sparsely pubescent abaxially, and a variable inflorescence (but always without stipitate-glands).